標題: A Robust Frequency Tracking Loop for Energy-Efficient Crystalless WBAN Systems
作者: Sung, Wei-Hao
Yu, Jui-Yuan
Lee, Chen-Yi
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: Crystalless;frequency calibration;on-chip oscillator;process;voltage and temperature (PVT) variation;wireless body area network (WBAN)
公開日期: 1-十月-2011
摘要: This brief presents a frequency tracking loop (FTL) to realize a crystalless wireless sensor node (WSN) for wireless body area network (WBAN). By tracking a remote wireless RF reference for system clock calibration, the proposed FTL allows WSNs to tolerate a large-frequency error from on-chip CMOS oscillators. Moreover, to achieve energy-efficient transmissions in crystalless, a sufficiently accurate convergence clock is required to enable burst overmegabits-per-second system throughput with minimized operation duty cycle. For the dedicated purpose, a comparison-based binary-search tracking scheme, which ensures accurate and robust convergence against noisy wireless channel, is further developed to manage the operation of FTL. The intermediate frequency back-end part of FTL is implemented in 90-nm CMOS process. Measurement results show that the FTL extends an initial tolerance of system clock error to +/- 3% and achieves a final quartz-crystal comparable +/- 50-ppm accuracy. This enables 4.85-Mb/s wireless links and improves 79% energy efficiency by RF operation-time reduction, giving a power-saved and miniaturized WSN device for WBAN applications.
URI: http://dx.doi.org/10.1109/TCSII.2011.2164155
http://hdl.handle.net/11536/14781
ISSN: 1549-7747
DOI: 10.1109/TCSII.2011.2164155
期刊: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
Volume: 58
Issue: 10
起始頁: 637
結束頁: 641
顯示於類別:期刊論文


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